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Library of Congress Subject Areas (240)
- A General Works (18)
  - AZ History of Scholarship The Humanities (18)
- C Auxiliary Sciences of History (1)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (1)
- G Geography. Anthropology. Recreation (8)
  - G Geography (General) (8)
  - GA Mathematical geography. Cartography (3)
- H Social Sciences (201)
  - HB Economic Theory (4)
  - HC Economic History and Conditions (2)
  - HE Transportation and Communications (194)
    - NA Nautical (15)
    - TE Technique (1)
  - HG Finance (3)
  - HJ Public Finance (1)
- L Education (8)
  - L Education (General) (8)
  - LA History of education (1)
  - LB Theory and practice of education (1)
- N Fine Arts (1)
  - TE Technique (1)
- Q Science (5)
  - Q Science (General) (4)
  - QE Geology (1)
  - QR Microbiology (1)
- T Technology (14)
  - T Technology (General) (7)
  - TA Engineering (General). Civil engineering (General) (9)
  - TD Environmental technology. Sanitary engineering (3)
  - TH Building construction (1)
  - TJ Mechanical engineering and machinery (1)
- V Naval Science (6)
  - V Naval Science (General) (5)
  - VM Naval architecture. Shipbuilding. Marine engineering (3)